unstable -
lacking stability or fixity or firmness; "unstable political conditions"; "the tower proved to be unstable in the high wind"; "an unstable world economy"
inconstant likely to change frequently often without apparent or cogent reason; variable; "inconstant affections"; "an inconstant lover"; "swear not by...the inconstant moon"- Shakespeare
unsteady subject to change or variation; "her unsteady walk"; "his hand was unsteady as he poured the wine"; "an unsteady voice"
explosive,
volatile serving to explode or characterized by explosion or sudden outburst; "an explosive device"; "explosive gas"; "explosive force"; "explosive violence"; "an explosive temper"
wobbly,
wonky,
rickety,
shaky inclined to shake as from weakness or defect; "a rickety table"; "a wobbly chair with shaky legs"; "the ladder felt a little wobbly"; "the bridge still stands though one of the arches is wonky"
rocky full of hardship or trials; "the rocky road to success"; "they were having a rough time"
seismal,
seismic subject to or caused by an earthquake or earth vibration
tipsy unstable and prone to tip as if intoxicated; "a tipsy boat"
changeful,
changeable such that alteration is possible; having a marked tendency to change; "changeable behavior"; "changeable moods"; "changeable prices"